As implied by the mysterious voice that speaks in the prologue, the date "December 23rd" means something to the Doctor. The voice encourages them to remember what happened back then even if it sends them into peril.
Arknights [Book Of Randomness]
Table of contents-
Rhodes Island
-
Age
-
"Traitor", they said.
-
Defense
-
Motto
-
Foil
-
Meaning of the name
-
Neutral no longer
-
Call for Aid
-
Look out of the Loop
-
Won't do anything
-
Private Military
-
Bunch of Mistfits
-
Dental
-
Doctor's intelligence
-
Doctor's personality
-
Doctor's love life
-
Fear of Doctor
-
Doctor's love life (2)
-
Race of the Doctor's rescue
-
Doctor's Major
-
Doctor's mysterious past
-
December 23
-
Favorite band
-
"I'm doing the right thing."
-
Doctor's Major (2)
-
Focus
-
Protagonist assets
-
Doctor's personality (2)
-
Kat'sit's past
-
Kat'sit's personality
-
Kat'sit's personality (2)
-
Kat'sit's secret
-
Kat'sit's reveal
-
Kat'sit's authority figure
-
Kat'sit's relationship with the Doctor
-
Kat'sit's relationship with the Doctor (2)
-
Closure's personality
-
Fumizuki's mysterious
-
Secret
-
Some Reveal
-
Some Reveal (2)
-
W's manipulation
-
Ability to sing (Mephisto)
-
Plot Point (Mephisto)
-
Flamebringer's mysterious past
-
Fear of Doctor (2)
-
Doctor's mysterious past (2)
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